function addMsg(msg, id_from)
{
	 $.ajax({
	   type: "POST",
	   url: "chat/ajaxChat.php",
	   data: "action=addMsg&msg="+msg+"&id_from="+id_from,
	   success: function(retour){
				$("#txt_send").val('');
				//$("#txt_chat").append("<br/>"+msg);
				$("#txt_send").focus();
		}
	 });
}

function getMsg(id_from, id_to)
{
	setTimeout ("getMsg(id_from, id_to);", 4000 );
	$.ajax({
	   type: "POST",
	   url: "chat/ajaxChat.php",
	   data: "action=getMsg&id_from="+id_from+"&id_to="+id_to,
	   success: function(retour){
				if(retour != "")
				{
					majHtml(retour);
				}
		}
	 });
}

function majHtml(msg)
{
	$('#txt_chat').append('<br/>'+msg);
	var scrollDiv = document.getElementById("txt_chat");
	scrollDiv.scrollTop = scrollDiv.scrollHeight;
}